Pneumatic drill



Dec. 1, 1925.

C. A. HULTQUIST mwnfumc DRILL Filed Aug. 14, 1922 2 Sheets-Sheet l INVENTOR. Ma a. waw

lm/ A olgNEYs Dec. 1, 1925.

c. A. HULTQulsT PNEUMAT I C DRI LL Filed Aug. 14, 1922 2 Sheets-Sheet 2 INVENToR.

d L m y,being` closed.

Aand

Patented Dec. l, 1925.

CHARLES A. HULTQUIST, 0F LOS ANGELES, CALIFCRNIA.

rNEUMA'rIc DRILL.

Application led August 14, 1922.

To @ZZ whom it may concern.' v

Be it known that I, CHARLES A. I'IULT- o'UIs'r, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented fa new and useful Pneumatic Drill, of 'which the following is a specification.

, This invention relates to rock drills of the fluid operated type, and more especially to that type employing a water tube.

In pneumatic drills employing water tubes, said tubes are subject to breakage or clogging, and, in either event, the water tube must be removed and repaired or another one substituted for it. In order to remove the tube it is necessary to take the machine apart, 4and it will be readily understood that, if this is done in the mine with drills having air ducts exposed at the joint where the parts are separated, dust, always present in the mine, will collect on the` members forming the joint and small particles of rock fall into the air feed control portand lodge between the wall of the feed cylinder and the cup leather, doing injury to both.

Because of liability to injury by dust when the repair is made in the mine, it has been customary and practically necessary to hoist the drillino' machine to the surface of the earth and have the repair made in a shop. This hoisting of the machine to the surface causes a considerable delay to the mining operations and also delays the hoisting machinery in performing other necessary. operations, thus increasing the mining costs.

n object of this invention is to make it possible to replace or clean the water tube in the mine without liability of the mine dust getting intothe drill and interfering with the etl'ective operation thereof.

'lhe accon'ipanying. drawings illustrate several forms of the invention:

Figure 1 is a longitudinal view of a pneu inutie drilleonstructed in accordancewith the provisions of this invention, a portion of (he drill steel being broken away.

2 is an enlarged fragmental section on the line VVindicatedby .2*2 Fig 1, the joint between the valve block and feed leg Fig. 3 is a sectionalview similar to Fig. y2, with the joint open, so that the water tube can be removed.

Fig.. 4 is a longitudinalview of the valve u 'np'loyed' in thel drilllshown in Figs. 1

Serial No. 581,633.

F ig. 5 is a plan view of a modified construction, looking at the upper end of the valve block, the hammer cylinder being omitted.

Fig. 6 `is a sectional elevation on the line indicated by 6 6 Fig. 5.

Fig. 7 is a longitudinal view of the valve employed in the modified construction shown in Figs. 5 and 6.

Describing first the form of the invention shown in Figs. 1 to 4, the valve block is indicated at 8 and is secured by bolts 9 or other suitable .means to the cylinder 10. In the cylinder 10 is the usual hammer 50. Extending transversely of the valve block S is a cylindrical chamber 11 in which is positioned a rotary valve 12. The valve chamber 11 communicates through a port 13 with the bore 14 of the cylinder 10. Thus when the valve 12 is appropriately turned it permits the operating fluid to iiow from the feed pipe 15 through the axial valve bore 28 and port 16 of the valve and through the port 13 to the cylinder bore.

The valve block 8 seats against the upper end of a feed cylinder 17 which contains the usualplunger 18 operated by compressed iiuid in the cylinder 17 to feed the drill so that the drill steel will be forcibly pressed against the rock being operated upon. In orderfto supply the feed cylinder" 17 with compressed fluid, it has heretofore been customary to pass the fluid from the valve chamber 12 directly to the feed cylinder -17, the port for carrying the fluid passing from the valve block into the upper end of the feed cylinder across the joint 19 between the valve block and the feed cylinder. In order to avoid the necessity of having the port exposed to dust, when the joint between the valve block and feed cylinder is broken, I have provided two different constructions, one of which, disclosed in Figs. 1, 2 and 3, will now be described.

The feed cylinder 17 is provided with an ear 2O inserted between a pair of ears 21 projecting from the valve block 8. Extending through the ears 20, 21 is a bolt 22 which constitutes a pivot or pintle, thus hinging the .valve block to the feed cylinder. The pintle 22 is provided with a duct 23 which extends forV a portion of its length axially of the pintle and is disposed at its opposite ends transversely of the axis. One end of the duct 23,co1nmi1nicates with a duct 24 in the ear 20,'said duct 24 communicating-with the boite of the cylinder 1 7. TheA other end of the duct 23 oininunicates with a duct 25 in one oit the ears 21, said duct 25 connnuY nicating with the valve chamber 11. When the valve 12 is in the position shown in Fig. 2, the duct 25 communicates with a duct 2.6 extending longitudinally of the valve and said duct 26 at the saine time registers with a port 27 opening through the Wall of the valvelchaniber tothe atmosphere. This, as will be clearly understood, p erinits discharge el"A operati-ng fluid that ina-y be i-n the feed cylinder 17.

The bore 2 8, oit' the valveisy provided with a port 29 coinniunicatingy With a duet 30 extending circuinferentialfly, of the' val-ve' 12. When the valve is turned to registerthelport 16 with the port 13;,r` the duet,l 30 registers with. the d uct 25V so thatl notV only is the operatingl fluid. admitted to the cylinder 10 but alsoto the feed. cylinder.l

A Water.` tube is shownA atV 31 andy isr packed inthe usual manner by packing 32 contained in a., recess 33 in the valve block 8,. The packing` 32v surrounds the tube 31 `between one end of thei recess. 3 3 and a shoulder 34' on the Water tube. Bearing against the shoulder 34. isv a= plug 35- whichpi's screw-threaded into the-,valve block, thus detachably holding the Water tube in place. rifhe Water tube 31, as is`r customary, extends through the hamnier ass'eenin Fig, 1.` The water tu-beis supplied With Water` through aduct 311 in the valve block and furnishes Water to the drill,

' notshown, in au nia-.nner well understood in this) art,

@in the; side ot the valve` block opposite the valve-is a longitudinal slot 36 in which is pivoted alatch bolt 37, the pivot being indicated at 38'. Thebolt isadapted to extend through a slotV 39 in the; feed cylinder 17, and the,y nut 40 of saidV bolt is adapted to bearV against the feed cylinder to releasably hold the valve; block closed upon thel feed cylinder. When the bolt 37 is released, the iteed'. block ina-y be thrown back atv right angies to the axis of the feed cylinder so that the operator. niay' readily unscrew the plug 35 and reniove the Water tube' 811.

1t is particularly notedv that when the Valveblcl. ie iT'n the?. open p-OstienA Shown, in Fig?) it is as ifnpossble foif-lust to. have. access to tlievar'ious ducts., tlratY connecty the valve chamber Withy the f eedf cylinder, as when. the block is'v in..th-:1eclosed position showniii Eig',. 2. 'Dliusinine dust cannot be entrained-` by theoperating;` fluid and. get into the bere off the feed cylinder between the viali" and, the plnligel.r`

New! referring Figs. .5.. @and 7, ASitzmngthe" inoded. term. it intendant-the parte: correspondinglto: those. slinwn, in fEigs. '1to4a`` lle 51the saine. riefeteuc' scri-bed; since aiu-ll description has been hereinbefore given. The construction in Figs. 5A to 7 differentiating from that shown in Figs. 1 to 4 is as follows:

rEhe valve block 8 is provided with an ear 41 through which extends a bolt 42 con-A st'ituting a pint-le or pivot whose axis is parallel with the longitudinal axis oi the feed cylinder 17. The pintle 42 also extends through an ear 43 of the feed cylinder 17 rlhe; pintle 42 is provided with a duct 44, a portionof` which extends axially of the pintle and the end portions of which extend transversely thereof. The duct 44 connnu'ni- Gates` with a4 duct 45 opening` into the valve chamber 1:1.` The other end of thel duct 4-4 communicates with ak duct 46opening into the bore of the feed cylinder 17. When. the valve 12 is in the position shown in Fig. G the duct communicates with a duct 47 ex tendinglengthwise o -f the valve and at the same tiine said duct 47 communicates with ay port 48l opening throughthe Wall of the valve. chamber to the atmosphere.

Then the valve 12 is in position to regis ter the port 16V with the port 13 the duct 45 registers with a. duct 51 extending circumi'erentially' of the valve12, said duct 51 comln'unicvating With the valve bore throughl a port 52.

To gainjaccess; to the`l water tube 31 the latch bolt will be released andthe valve block Willthen be swung laterally on itsl pintle 42. litvivillv non7 be clear thatk the only difference between the two forins of the invention is thatin' the drill shown in Figs. 1 to4the valveblock opens. in a plane extending longitudinally of the-axis oi the drill, Whereas inthe form illustrated in Figs. 5 to 7J the. valve blockgopens in a plane extending transversely of the axis of the drill.

Iiclaini:

1,. In a pneumatic drill,y the combination of a valve block having a Water supply duct, a cylinder connected with the valve block, ahannner in thecylinder, al Water tubo receiving Water troni said duct and extending' through the-I hammer and detachably en gaging the valve block to supply Water to the drill, a feed cylinder hingedly connected to i the valve block, the hingeconnection having a` duct, the.y feed cylgi-nderf having a duct oonnefeti'ng( bore with the second duct, the valvefbtlocl; having a valve cliaaiiberA and hairing a duct connectingsaidchaniher with the second duct, tlieiie',4 being a port in the valve bloeit connecting the vf'alae chamber With the lore of the first cylinder, a plunger inA the feed cylinder, a valve in the valve chamber @strolling the next. and the duct in the rene; bloeit., means; to non; en. van@ block closed upon the feed cylinder.. v

a, pneumatic, drill, the combina-tion NeffaL feed- V ialLfAbIQclnlliiglgdly connected to the` feed cylinder, and' :t va'lye 3"" mounted in the Valvey block, there being an nii' passage controlledby the valve and extending through the hinge connection and con'nnunicating with the here of the feed cylindei'.

3. In a pneumatic drill, the combination of a feed cylinder, zt valve block, a pvot connecting the Valve block to the feed cylinder, und :L valve mounted in the valve block, there being an air passage controlled by the 10 Valve and extending through the pivot and communicating with the bore of the `feed' cylinder.

Signed at Los Angeles, California, this 3d day of August, 1922.

CHARLES A. HULTQUIST. 

